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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 5,563,529 | $ 4,980,060 | $ 10,562,701 | $ 9,534,463
Total revenue | 150,544 | 131,374 | 286,882 | 250,923
Total revenue | 5,714,073 | 5,111,434 | 10,849,583 | 9,785,386
Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2,028,414 | 1,827,732 | 3,726,478 | 3,407,617
Total revenue | 150,544 | 131,374 | 286,882 | 250,923
Total revenue | 2,178,958 | 1,959,106 | 4,013,360 | 3,658,540
Global Workplace Solutions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 3,385,452 | 3,034,973 | 6,551,367 | 5,862,476
Total revenue | 3,385,452 | 3,034,973 | 6,551,367 | 5,862,476
Real Estate Investments [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 149,663 | 117,355 | 284,856 | 264,370
Total revenue | 149,663 | 117,355 | 284,856 | 264,370
Global Workplace Solutions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 3,385,452 | 3,034,973 | 6,551,367 | 5,862,476
Global Workplace Solutions [Member] | Global Workplace Solutions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 3,385,452 | 3,034,973 | 6,551,367 | 5,862,476
Advisory Leasing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 817,788 | 687,386 | 1,440,428 | 1,204,895
Advisory Leasing [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 817,788 | 687,386 | 1,440,428 | 1,204,895
Advisory Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 466,558 | 457,376 | 852,213 | 871,108
Advisory Sales [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 466,558 | 457,376 | 852,213 | 871,108
Property and Advisory Project Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 555,822 | 502,201 | 1,076,706 | 986,983
Property and Advisory Project Management [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 555,822 | 502,201 | 1,076,706 | 986,983
Valuation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 149,051 | 147,397 | 287,377 | 281,560
Valuation [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 149,051 | 147,397 | 287,377 | 281,560
Commercial Mortgage Origination [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 32,111 | 27,856 | 55,684 | 52,138
Total revenue | 107,888 | 92,982 | 205,194 | 176,134
Commercial Mortgage Origination [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 32,111 | 27,856 | 55,684 | 52,138
Total revenue | 107,888 | 92,982 | 205,194 | 176,134
Loan Servicing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 7,084 | 5,516 | 14,070 | 10,933
Total revenue | 42,656 | 38,392 | 81,688 | 74,789
Loan Servicing [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 7,084 | 5,516 | 14,070 | 10,933
Total revenue | 42,656 | 38,392 | 81,688 | 74,789
Investment Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 101,646 | 98,947 | 207,954 | 222,637
Investment Management [Member] | Real Estate Investments [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 101,646 | 98,947 | 207,954 | 222,637
Development Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 48,017 | 18,408 | 76,902 | 41,733
Development Services [Member] | Real Estate Investments [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 48,017 | $ 18,408 | $ 76,902 | $ 41,733

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